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feat: Redirections, print error function #32
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@Oris482
Oris482 committed Sep 12, 2022
1 parent 0fce330 commit 8a5dad5
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Showing 2 changed files with 184 additions and 2 deletions.
24 changes: 22 additions & 2 deletions error_utils.c
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Original file line number Diff line number Diff line change
Expand Up @@ -3,10 +3,10 @@
/* ::: :::::::: */
/* error_utils.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: minsuki2 <minsuki2@student.42seoul.kr +#+ +:+ +#+ */
/* By: jaesjeon <jaesjeon@student.42seoul.kr> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2022/09/04 19:12:42 by minsuki2 #+# #+# */
/* Updated: 2022/09/07 19:36:58 by minsuki2 ### ########.fr */
/* Updated: 2022/09/12 02:05:33 by jaesjeon ### ########.fr */
/* */
/* ************************************************************************** */

Expand All @@ -30,3 +30,23 @@ void print_error_syntax(char *str)


// void print_error_command_not(char *str)

int print_error_str(const char *err_cmd, const char *err_arg, \
const char *custom_msg, int err_code)
{
const char *err_msg = strerror(errno);

ft_putstr_fd("minishell: ", STDERR_FILENO);
ft_putstr_fd(err_cmd, STDERR_FILENO);
ft_putstr_fd(": ", STDERR_FILENO);
if (err_arg != NULL)
{
ft_putstr_fd(err_arg, STDERR_FILENO);
ft_putstr_fd(": ", STDERR_FILENO);
}
if (custom_msg == NULL)
ft_putendl_fd(err_msg, STDERR_FILENO);
else
ft_putendl_fd(custom_msg, STDERR_FILENO);
return (err_code);
}
162 changes: 162 additions & 0 deletions executor/redirections.c
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Original file line number Diff line number Diff line change
@@ -0,0 +1,162 @@
/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* redirections.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: jaesjeon <jaesjeon@student.42seoul.kr> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2022/09/11 13:50:16 by jaesjeon #+# #+# */
/* Updated: 2022/09/12 02:42:57 by jaesjeon ### ########.fr */
/* */
/* ************************************************************************** */

#include "../minishell.h"

static char *_make_tmpname(char *prefix)
{
struct stat *buf;
char *ret;
char *suffix;
int i;

ret = NULL;
ft_strjoin_self(&ret, "/tmp/");
ft_strjoin_self(&ret, prefix);
suffix = "_j2m1";
i = 0;
while (i++ < 5)
{
stat(ret, buf);
if (errno == ENOENT)
{
errno = 0;
return (ret);
}
ft_strjoin_self(&ret, suffix);
}
return (NULL);
}

static int _make_tmpfile(char **tmpname, int *fd)
{
*tmpname = _make_tmpname("minishell");
if (*tmpname == NULL)
return (FALSE);
*fd = open(*tmpname, O_WRONLY | O_CREAT | O_EXCL | O_TRUNC, 0600);
if (*fd == ERROR)
return (FALSE);
return (SUCCESS);
}

int handle_redirections_error(const char *cmd, const char *arg)
{
if (errno == EACCES)
return (print_error_str(cmd, arg, \
"Permission denied", GENERAL_EXIT_CODE));
else if (errno == EIO)
return (print_error_str(cmd, arg, \
"I/O error occurs", GENERAL_EXIT_CODE));
else if (errno == EISDIR)
return (print_error_str(cmd, arg, \
"It is a directory", GENERAL_EXIT_CODE));
else if (errno == EMFILE)
return (print_error_str(cmd, arg, \
"Reached limit for open fd", GENERAL_EXIT_CODE));
else if (errno == ENAMETOOLONG)
return (print_error_str(cmd, arg, \
"File name is too long", GENERAL_EXIT_CODE));
else if (errno == ENOENT)
return (print_error_str(cmd, arg, \
"No such file or directory", GENERAL_EXIT_CODE));
else if (errno == ENOTDIR)
return (print_error_str(cmd, arg, \
"Not a directory", GENERAL_EXIT_CODE));
else
return (print_error_str(cmd, arg, NULL, GENERAL_EXIT_CODE));
}

int redi_heredoc(char *limiter)
{
int fd[2];
char *tmpname;
char *line;

if (_make_tmpfile(&tmpname, &fd[F_WRITE]) == FALSE)
return (handle_redirections_error("Here-doc", NULL));
line = readline("> ");
while (line && !ft_strcmp(line, limiter))
{
write(fd[F_WRITE], line, ft_strlen(line));
write(fd[F_WRITE], "\n", 1);
line = readline("> ");
}
close(fd[F_WRITE]);
fd[F_READ] = open(tmpname, O_RDONLY);
unlink(tmpname);
my_free(tmpname);
if (dup2(fd[F_READ], STDIN_FILENO) == ERROR)
return (print_error_str("here-doc", NULL, NULL, GENERAL_EXIT_CODE));
close(fd[F_READ]);
return (SUCCESS_EXIT_CODE);
}

int redi_in(char *filename)
{
int fd;

fd = open(filename, O_RDONLY);
if (fd == ERROR)
return (handle_redirections_error("Redi-in", filename));
if (dup2(fd, STDIN_FILENO) == ERROR)
{
close(fd);
return (print_error_str("Redi-in", NULL, NULL, GENERAL_EXIT_CODE));
}
close(fd);
return (SUCCESS_EXIT_CODE);
}

int redi_out(char *filename, int extra_mode)
{
const int open_mode = O_WRONLY | O_CREAT | extra_mode;
const int file_modes = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH;
int fd;

fd = open(filename, open_mode, file_modes);
if (fd == ERROR)
return (handle_redirections_error("Redi-out", filename));
if (dup2(fd, STDOUT_FILENO) == ERROR)
{
close(fd);
return (print_error_str("redi-out", NULL, NULL, GENERAL_EXIT_CODE));
}
close(fd);
return (SUCCESS_EXIT_CODE);
}

int redi_middleware(t_lx_token *token)
{
int exit_code;

exit_code = SUCCESS_EXIT_CODE;
while (token)
{
if (token->token_type == RED_IN)
exit_code = redi_in(get_token_str(token->next));
else if (token->token_type == RED_OUT)
exit_code = redi_out(get_token_str(token->next), O_TRUNC);
else if (token->token_type == RED_APD_OUT)
exit_code = redi_out(get_token_str(token->next), O_APPEND);
else if (token->token_type == HERE_DOC)
exit_code = redi_heredoc(token->next->token_str);
else
break ;
if (exit_code != SUCCESS_EXIT_CODE)
break ;
token = token->next->next;
}
if (exit_code == SUCCESS_EXIT_CODE && token != NULL)
return (print_error_str("Redirect", token->prev->token_str, \
"ambigous redirect", GENERAL_EXIT_CODE));
return (exit_code);
}

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